arch/riscv/include/asm/bug.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2012 Regents of the University of California
   4  */
   5
   6 #ifndef _ASM_RISCV_BUG_H
   7 #define _ASM_RISCV_BUG_H
   8
   9 #include <linux/compiler.h>
  10 #include <linux/const.h>
  11 #include <linux/types.h>
  12
  13 #include <asm/asm.h>
  14
  15 #define __INSN_LENGTH_MASK  _UL(0x3)
  16 #define __INSN_LENGTH_32    _UL(0x3)
  17 #define __COMPRESSED_INSN_MASK  _UL(0xffff)
  18
  19 #define __BUG_INSN_32   _UL(0x00100073) /* ebreak */
  20 #define __BUG_INSN_16   _UL(0x9002) /* c.ebreak */
  21
  22 #define GET_INSN_LENGTH(insn)                                           \
  23 ({                                                                      \
  24         unsigned long __len;                                            \
  25         __len = ((insn & __INSN_LENGTH_MASK) == __INSN_LENGTH_32) ?     \
  26                 4UL : 2UL;                                              \
  27         __len;                                                          \
  28 })
  29
  30 typedef u32 bug_insn_t;
  31
  32 #ifdef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
  33 #define __BUG_ENTRY_ADDR        RISCV_INT " 1b - 2b"
  34 #define __BUG_ENTRY_FILE        RISCV_INT " %0 - 2b"
  35 #else
  36 #define __BUG_ENTRY_ADDR        RISCV_PTR " 1b"
  37 #define __BUG_ENTRY_FILE        RISCV_PTR " %0"
  38 #endif
  39
  40 #ifdef CONFIG_DEBUG_BUGVERBOSE
  41 #define __BUG_ENTRY                     \
  42         __BUG_ENTRY_ADDR "\n\t"         \
  43         __BUG_ENTRY_FILE "\n\t"         \
  44         RISCV_SHORT " %1\n\t"           \
  45         RISCV_SHORT " %2"
  46 #else
  47 #define __BUG_ENTRY                     \
  48         __BUG_ENTRY_ADDR "\n\t"         \
  49         RISCV_SHORT " %2"
  50 #endif
  51
  52 #ifdef CONFIG_GENERIC_BUG
  53 #define __BUG_FLAGS(flags)                                      \
  54 do {                                                            \
  55         __asm__ __volatile__ (                                  \
  56                 "1:\n\t"                                        \
  57                         "ebreak\n"                              \
  58                         ".pushsection __bug_table,\"aw\"\n\t"   \
  59                 "2:\n\t"                                        \
  60                         __BUG_ENTRY "\n\t"                      \
  61                         ".org 2b + %3\n\t"                      \
  62                         ".popsection"                           \
  63                 :                                               \
  64                 : "i" (__FILE__), "i" (__LINE__),               \
  65                   "i" (flags),                                  \
  66                   "i" (sizeof(struct bug_entry)));              \
  67 } while (0)
  68 #else /* CONFIG_GENERIC_BUG */
  69 #define __BUG_FLAGS(flags) do {                                 \
  70         __asm__ __volatile__ ("ebreak\n");                      \
  71 } while (0)
  72 #endif /* CONFIG_GENERIC_BUG */
  73
  74 #define BUG() do {                                              \
  75         __BUG_FLAGS(0);                                         \
  76         unreachable();                                          \
  77 } while (0)
  78
  79 #define __WARN_FLAGS(flags) __BUG_FLAGS(BUGFLAG_WARNING|(flags))
  80
  81 #define HAVE_ARCH_BUG
  82
  83 #include <asm-generic/bug.h>
  84
  85 struct pt_regs;
  86 struct task_struct;
  87
  88 void __show_regs(struct pt_regs *regs);
  89 void die(struct pt_regs *regs, const char *str);
  90 void do_trap(struct pt_regs *regs, int signo, int code, unsigned long addr);
  91
  92 #endif /* _ASM_RISCV_BUG_H */